PZN-PZT 복합체의 에어로졸 증착법에 의해 제조된 후막과 고에너지 볼밀법을 이용한 소결체의 전기적 특성 연구

Abstract

Lead zinc niobate - lead zirconate titanate (PZN-PZT) nano size powders with diameter of ~35 nm were fabricated by using high energy ball-milling process. The micro size PZN-PZT powders prepared by conventional mixed oxide method were ball-milled with high energy using the milling media of 0.1 mm diameter zirconia beads at a rotation speed of 4000 RPM for 1 h. The high energy milled nano size powders were then pressed and sintered in the temperature range from 700 to 900℃. The control of evaporation of lead oxide was very important to obtain high electrical properties due to the increased surface area of nano size powders. The ceramics sintered using nano-sized powder showed nearly full density at a temperature of lower than 800℃, which is notably lower temperature than the sintering temperature of conventionally prepared micro size powder. The ferroelectric hysteresis, dielectric constant, piezoelectric d33 values of sintered ceramics using nano size powder were measured and compared with the values obtained from sintered specimen from micro size powders.